title: Alloying and Structure of Ultrathin Gallium Films on the (111) and (110) Surfaces of Palladium.
abstract: Growth, thermal stability, and structure of ultrathin gallium films on Pd(111) and Pd(110) are investigated by low-energy ion scattering and low-energy electron diffraction. Common to both surface orientations are growth of disordered Ga films at coverages of a few monolayers (T= 150 K), onset of alloy formation at low temperatures (T≈ 200 K), and formation of a metastable, mostly disordered 1:1 surface alloy at temperatures around 400-500 K. At higher temperatures a Ga surface fraction of ∼0.3 is slightly stabilized on Pd(111), which we suggest to be related to the formation of Pd2Ga bulk-like films. While on Pd(110) only a Pd-up/Ga-down buckled surface was observed, an inversion of buckling was observed on Pd(111) upon heating. Similarities and differences to the related Zn/Pd system are discussed.
authors.affiliation: Institute of Physical Chemistry, University of Innsbruck , A-6020 Innsbruck, Austria.
authors.forename: Werner
authors.initials: W
authors.lastname: Stadlmayr
authors.forename: Veronika
authors.initials: V
authors.lastname: Huber
authors.forename: Simon
authors.initials: S
authors.lastname: Penner
authors.forename: Bernhard
authors.initials: B
authors.lastname: Klötzer
authors.forename: Norbert
authors.initials: N
authors.lastname: Memmel